I've been quite relaxed about it before, primarily because I didn't have other options available.
That's the intention for logged in users. Three banners per page, two of which you might not even notice.
There are more ads for guests (just login!), but there shouldn't be any full-screen stuff now, although I need to make sure I keep checking the ad partners aren't being sneaky.
They shouldn't be for logged in users. The top banner was big over the weekend due to a config issue with the ad partner, but that was resolved first thing this morning.